Improvement in hot-air furnaces



H. D. FREER.

Hot-Air Furnace.

Patented Sept. 14,1875.

In wen 20m Wz'inesses.

Law/w. 74/% 40/0 NVPETERS, FHOTO-LITHOGRAPHER. WASHINGTON. D. C.

n'rrnn STATES PATENT QFFIOE HIRAM D. FBEER, on AKRON, OHIO.

IMPROVEMENT IN HQT AIR even/ ices.

Specification forming part of Letters Patent No. 1 67,657, dated September 14, 1875; application filed June 2-2, 1875.

To all whom it may concern:

insure more perfect combustion of fuel by the construction of a fire-pot which shall introduce upon the burning fuel jets of heated atmospheric air; second, to cause more even distribution of the heat from the fire upon the radiating-drum by means of a partition or web between the inside of the radiatingdrum and the outside of the fire-pot, extending from the upper back edge of the fire-pot diagonally on each side toward the front and bottom thereof; third, to provide a more simple device for down-draft, by having a single smoke-flue divided longitudinally by a midfeather, either half of which may be closed by' a semicircular damper; and, fourth, to break up olinkers by a grate composed of independent bars of peculiar pattern. 7

My invention is fully shown in the drawing hereto attached, wherein Figure 1 is a vertical central section of a hot-air furnace embodying my improvements; Fig. 2, a view of the fire-pot and radiatingdrum, to show the arrangement of the deflecting partition, and Fig. 3 a plan of the furnace with the cover removed.

The furnace does not differ in general arrangement from furnaces in common use; and consists of the double case K I, resting upon a cast base, Q, the radiating-drum H, and fire-pot A lined with fire-brick B and supplied with fuel through the box Gr.

The fire-potA has air-passages cast therein passing entirely around it at the top and bottom, the two communicating through upright passages similarly formed, the upper one opening into the interior of the pot smoke and gas, thereby effecting an increase closing either flue of the pipe F to provide either a direct upward or a down draft, as desired.

Beginning at either side of the flue E, at

the top of the fire-pot, is a partition between the fire-pot A and the drum H, and passing on each side diagonallyaround the fire-pot toward the front and bottom thereof, leaving only a portion of the space between the firepot and the drum open at the front.

Experience has demonstrated that this position of the partition conforms nearly to the natural direction taken by the flame in seek in g an outlet through a lower front opening, and affords a more complete action of the flame against the entire inside of the drum H than when the partition is placed horizon tally at any point between the bottom and top of thefire-pot.

The grate is composed of single independent bars 0 resting upon cross-supports M N, (see Fig. 1,) plain on theunder surface, but

assuming on the other sides the form of a series of frustums of quadrilateral pyramids attached together, top to base.

The peculiar shape of these bars renders them efficacious in breaking up and removing clinker, while, being single independent bars, they are easily rearranged as they are affected by heat, and removed and replaced when worn out.

Having thus described my invention, I claim-- 4 i 1. The fire-pot A, cast with the air-passages passing entirely around its upper and lower ends, and the upper passage opening into the fire-pot, and the vertical passages communicating with said top and bottom passages, in combination with the horizontal air-passage on communicating with the external air, as and for the object specified.

2. The combination, in a hot-air furnace, of

2 p 167,657 a I the double casing K I, the base Q, the fire-pot longed and extends beneath the diagonal par- A, resting upon said base, and constructed tition of the fire-pot, as and forthe purpose with the diagonally-arranged partition D, tlknle described. closed radiating-drum H,' arranged over t e V V fire-pot and the lateral pipe F, projecting HIRAM FREER' through the double casing, and constructed Witnesses:

with the fines, the upper one of which opens C. P. HUMPHREY,

into the drum H, While the lower one is pro- I F. M. FESSENDEN. 

